Flutter update dev again (#486)

diff --git a/Dockerfile b/Dockerfile
index 6cea0ec..f289583 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 # The specific commit that dart-services should use. This should be kept
 # in sync with the flutter submodule in the dart-services repo.
 # (run `git rev-parse HEAD` from the flutter submodule to retrieve this value.
-ARG FLUTTER_COMMIT=4049889d9eecc8fb3eda316a5c371eeb636b2ae5
+ARG FLUTTER_COMMIT=1606d878348e98fb1c401679ca8e006c7b7eb41f
 
 # We install unzip and remove the apt-index again to keep the
 # docker image diff small.
diff --git a/flutter b/flutter
index 4049889..1606d87 160000
--- a/flutter
+++ b/flutter
@@ -1 +1 @@
-Subproject commit 4049889d9eecc8fb3eda316a5c371eeb636b2ae5
+Subproject commit 1606d878348e98fb1c401679ca8e006c7b7eb41f